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https://issues.apache.org/jira/browse/HDFS-11164?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15724275#comment-15724275
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Uma Maheswara Rao G commented on HDFS-11164:
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[~rakeshr] Overall patch looks good to me. +1
[~surendrasingh] since you tested mover scenarios before, do you mind checking
this patch with your clusters whether its effecting any of your scenarios?
> Mover should avoid unnecessary retries if the block is pinned
> -------------------------------------------------------------
>
> Key: HDFS-11164
> URL: https://issues.apache.org/jira/browse/HDFS-11164
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: balancer & mover
> Reporter: Rakesh R
> Assignee: Rakesh R
> Attachments: HDFS-11164-00.patch, HDFS-11164-01.patch,
> HDFS-11164-02.patch, HDFS-11164-03.patch
>
>
> When mover is trying to move a pinned block to another datanode, it will
> internally hits the following IOException and mark the block movement as
> {{failure}}. Since the Mover has {{dfs.mover.retry.max.attempts}} configs, it
> will continue moving this block until it reaches {{retryMaxAttempts}}. If the
> block movement failure(s) are only due to block pinning, then retry is
> unnecessary. The idea of this jira is to avoid retry attempts of pinned
> blocks as they won't be able to move to a different node.
> {code}
> 2016-11-22 10:56:10,537 WARN
> org.apache.hadoop.hdfs.server.balancer.Dispatcher: Failed to move
> blk_1073741825_1001 with size=52 from 127.0.0.1:19501:DISK to
> 127.0.0.1:19758:ARCHIVE through 127.0.0.1:19501
> java.io.IOException: Got error, status=ERROR, status message opReplaceBlock
> BP-1772076264-10.252.146.200-1479792322960:blk_1073741825_1001 received
> exception java.io.IOException: Got error, status=ERROR, status message Not
> able to copy block 1073741825 to /127.0.0.1:19826 because it's pinned , copy
> block BP-1772076264-10.252.146.200-1479792322960:blk_1073741825_1001 from
> /127.0.0.1:19501, reportedBlock move is failed
> at
> org.apache.hadoop.hdfs.protocol.datatransfer.DataTransferProtoUtil.checkBlockOpStatus(DataTransferProtoUtil.java:118)
> at
> org.apache.hadoop.hdfs.server.balancer.Dispatcher$PendingMove.receiveResponse(Dispatcher.java:417)
> at
> org.apache.hadoop.hdfs.server.balancer.Dispatcher$PendingMove.dispatch(Dispatcher.java:358)
> at
> org.apache.hadoop.hdfs.server.balancer.Dispatcher$PendingMove.access$5(Dispatcher.java:322)
> at
> org.apache.hadoop.hdfs.server.balancer.Dispatcher$1.run(Dispatcher.java:1075)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:745)
> {code}
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